Scientific study of all the interrelationships between organisms and their environment.

• Ecology
• Population 
• Biology
• Chemistry

Any living factor in an organism’s environment.

• Abiotic  Facor
• Biotic Factor 

Any non living factor in an organism’s environment, such as soil, water temperature, and light availability.

• Biotic Factor
• Abiotic Factor 

Group of organisms of the same species that occupy the same geographic place at the same time.

• Population 
• Community
• Biome
• Habitat

Group of interacting populations that live in the same geographic area

• Ecosystem
• Community
• Biosphere
• Habitat

Physical area in which an organism lives.

• Earth
• Ecology 
• Biome
• Habitat

Large group of ecosystems that share the same climate and have similar types of communities.

• Biome
• Biosphere
• Biotic
• Abiotic

Act of one organism feeding on another organism.

• Predation
• Symbiosis
• Community
• Pasitism

Close mutualistic, parasitic or commensal association between two or more species that live together.

• Symbiosis
• Parasitism
• Predation
• Habitat

Symbiotic relationship that is positive for one organism and negative for the other organism.  

• Parasitism
• Mutualism
• Symbiosis
• Predation